Remark 1 
Having assumed that both the BS and UEs are aware of large-scale statistics, the model in (REF ) can describe the scenario, where the \( k \) th UE in the group \( g \)  quantizes \( {\mathbf {h}}_{g_{k}} \)  with the help of a random codebook and sends back the codeword index to the BS [1]}. We provide an example of the advantage of using this method in Sec. .

